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Using Adobe Bridge you can create a Metadata Template to bulk add them to your images at the same time.
You can add your company name, copyright, etc. then apply that template to the images.
Going into properties one at a time given the volume of assets would be futile.
I'll say Bridge the best way to go as well. The Metadata Panel is very complete in these Categories.
Select all the files in your folder, add and commit (check-mark at the bottom), and the metadata is applied on one single run.
If the same information is going to be used in other images, as mentioned, you create a Metadata template:
Place the metadata you need into this form, save it, and load it into later images without re-entering the information.
Bridge CC 2017 is a free and separate download and a great Image manager.